网卡绑定bond0的实现

1、虚拟机添加一张网卡

2、通过ip a可以看到多了一张eth1网卡

 3、创建bond0

[root@rocky8-1 ~]#nmcli connection add type bond con-name mybond0 ifname bond0 mode active-backup ipv4.method manual ipv4.address 192.168.177.100/24   #添加bonding接口，模式为主备模式并设置ip
Connection 'mybond0' (f081fbd6-f844-4bcd-99cf-3d9d9d47c063) successfully added.
[root@rocky8-1 ~]#nmcli connection add type bond-slave ifname eth0 master bond0       #添加从属接口eth0
Connection 'bond-slave-eth0' (3b9dcf40-da25-4045-8f67-03b93d3dabce) successfully added.
[root@rocky8-1 ~]#nmcli connection add type bond-slave ifname eth1 master bond0       #添加从属接口eth1
Connection 'bond-slave-eth1' (efd8ed09-bbd9-4500-8a3b-11d0f9afaf14) successfully added.
[root@rocky8-1 ~]#nmcli connection 
NAME             UUID                                  TYPE      DEVICE 
eth0             5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03  ethernet  eth0   
mybond0          f081fbd6-f844-4bcd-99cf-3d9d9d47c063  bond      bond0  
virbr0           7d51fad9-62e3-4890-848d-464a8f8001b0  bridge    virbr0 
bond-slave-eth1  efd8ed09-bbd9-4500-8a3b-11d0f9afaf14  ethernet  eth1   
bond-slave-eth0  3b9dcf40-da25-4045-8f67-03b93d3dabce  ethernet  --     
[root@rocky8-1 ~]#ls /etc/sysconfig/network-scripts/
ifcfg-bond-slave-eth0  ifcfg-bond-slave-eth1  ifcfg-eth0  ifcfg-mybond0

 [root@rocky8-1 ~]#nmcli connection up bond-slave-eth0   #先启动从属接口eth0
 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)
 [root@rocky8-1 ~]#nmcli connection up bond-slave-eth1   #启动从属接口eth1
 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/7)

 [root@rocky8-1 ~]#nmcli conn up mybond0                 #启动绑定
 Connection successfully activated (master waiting for slaves) (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)

通过ip a命令可以看到eth0 eth1网卡已经没有ip地址，mac地址相同

[root@rocky8-1 ~]#cat /proc/net/bonding/bond0         #查看此文件看到当前主网卡是eth0，eth1为备用
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: eth0
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Peer Notification Delay (ms): 0

Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:49:e3:f9
Slave queue ID: 0

Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:49:e3:03
Slave queue ID: 0

断开eth0接口可看到网络丢了一个包重新连上

 将eth0启用，断开eth1，可看到网络丢一个包后重连正常

 将2个网卡都断开后网络中断